The N20 is an inline 4, but is considered a replacement for the straight-6 N52 and N53 because it powers equivalent models. It features a twin-scroll turbocharger, variable valve timing (VANOS), variable valve lift (valvetronic) and direct injection.

This is all good and great. For the record, I think fuel economy would be a cool thing to have. But.........................I drove home a 328i tonight as a loaner and I'm wholly unimpressed with the build quality.